diff --git a/setup.cfg b/setup.cfg
index 2910f5df..9359c6f3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -38,7 +38,7 @@ install_requires =
     google-auth<2.0dev,>=1.21.1
     httplib2>=0.15.0
     service_identity==17.0.0
-    protobuf==3.15.8
+    protobuf==3.20.1
     pyopenssl==17.5.0
     six==1.13.0
     click==7.1.2